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Merge kept the target's fields, unioned locations and tags, and trashed the sources — recording nothing about what it absorbed. If a variant handled an edge case the survivor doesn't, that difference left the visible record entirely; recovering it meant knowing to go digging in the trash. The survivor now carries `merged_from`: a "**Merged from:** #2, #3" line in the body for humans, and the same list in the `data` mirror for queries, written from one value like every other field (#2087). It accumulates rather than replaces — a target merged twice keeps both histories — and skipped sources (cross-owner, per #231) are excluded, so the record never claims to contain something it never absorbed. Ordinary edits carry it forward. update_snippet recomposes body and mirror from scratch, so an omission there would silently erase the history on the next unrelated edit; that path is pinned by its own test, including the pre-0070 case where the body line is the only copy. Surfaced in the snippet detail view as a "Merged from" row — the view renders parsed fields, not the raw body, so the body line alone would have been invisible to the operator (rule #27). Un-merge, the other half of #2087, stays open: restoring a source from trash still doesn't strip its locations off the survivor, and what partial un-merge should mean is a design question, not a coding one. `merged_from` is the record that makes it tractable. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RLwAaV4DQEmVyn496HnEvt